CNUT 1.1 Problems while loading a saved file

Hi, I´m a newby in working with CNUT. So maybe my question is a little bit strange!! Sorry for that!!

At the moment I am trying to use CNUT 1.1. Everything works fine! But when I try to load a saved network archive, I´ve got following
message: The network Archive File: has been opened. Do you wish to Refresh/Discover the Entire Network? “Yes” or “No”!

When I press “Yes” following message appears:
No programmable Network Elements selected!!

If I press “No”, nothing happens.

What do I wrong?? Thank you for helping me!!